A device for bone fixation is comprised of an expansion part and a covering part. The expansion part has a fixing end and a top end and provides an expandable structure for being adjusted in a state of expansion or contraction. The covering part has a front end and a joining end, wherein the front end thereof is joined to the top end of the expansion part, and the joining end thereof is attached to the fixing end of the expansion part. The covering part is employed to cover the expandable structure. After the expansion part and the covering part being added to the bone, the covering part is unfurled to spread to the expansion state, and the medical filler is stuffed or poured into the covering part.本發明之骨固定裝置,其包括:一展開裝置,其一端為固定端,另一端為頂端,該展開裝置具有一展開結構,該展開結構可調整為展開狀態或收縮狀態;及一包覆裝置,其一端為前端,另一端為連結端,其中該包覆裝置之前端與該展開裝置之頂端結合,該包覆裝置之連結端用以固定於該展開裝置之固定端,該包覆裝置用以包覆該展開結構;其中該展開裝置與該包覆裝置放入骨骼後,該包覆裝置可藉由該展開裝置之展開結構將其撐開,待該展開結構將該包覆裝置撐開至展開狀態,由該展開裝置之固定端將醫療填充物塞入或灌入該包覆裝置中。100‧‧‧展開裝置110‧‧‧展開結構120‧‧‧固定端140‧‧‧套件200‧‧‧包覆裝置210‧‧‧類球型包覆部件220‧‧‧連結端300‧‧‧協助展開裝置310‧‧‧操縱桿320‧‧‧結合端330‧‧‧操縱端340‧‧‧中空結合管件341‧‧‧中空結合管件前端342‧‧‧中空結合管件後端
